Map, reduce, filter, fold, project, transform, group_by, bind, apply - any functional API you care to look is all verbs. Functions do work. That doesn't mean t

Map, reduce, filter, fold, project, transform, group_by, bind, apply - any functional API you care to look is all verbs. Functions do work. That doesn't mean they have to have side-effects; if they're functional, they do work on the input and produce output. Doing is a verb. It's natural. Using a noun as a function name is at best justified when you have a situation where you want to hide whether data is being calculated on demand, or fetched from some storage or lookup table. Some languages bake this in, in the form of properties - attributes of a structure which look like fields, but are actually functions. Those things have nouns as names.